Angular 项目实现国际化的方法(3)

 

这样提取文案信息和转换翻译后的文件就完成了,接下来我们需要把翻译好的文案应用到项目中去。

部署翻译文件

src目录下新建locale文件夹,将翻译转换后的demo.en-US.xlf文件存在改目录下

app文件夹下新建i18n-providers.ts

import {
 LOCALE_ID,
 MissingTranslationStrategy,
 StaticProvider,
 TRANSLATIONS,
 TRANSLATIONS_FORMAT
} from '@angular/core';
import { CompilerConfig } from '@angular/compiler';
import { Observable } from 'rxjs/Observable';
import { LOCALE_LANGUAGE } from './app.config'; // 自行定义配置位置

export function getTranslationProviders(): Promise<StaticProvider[]> {

 // get the locale string from the document
 const locale = LOCALE_LANGUAGE.toString();

 // return no providers
 const noProviders: StaticProvider[] = [];

 // no locale or zh-CN: no translation providers
 if (!locale || locale === 'zh-CN') {
  return Promise.resolve(noProviders);
 }

 // Ex: 'locale/demo.zh-MO.xlf`
 const translationFile = `./locale/demo.${locale}.xlf`;

 return getTranslationsWithSystemJs(translationFile)
  .then((translations: string) => [
   { provide: TRANSLATIONS, useValue: translations },
   { provide: TRANSLATIONS_FORMAT, useValue: 'xlf' },
   { provide: LOCALE_ID, useValue: locale },
   {
    provide: CompilerConfig,
    useValue: new CompilerConfig({ missingTranslation: MissingTranslationStrategy.Error })
   }
  ]).catch(() => noProviders); // ignore if file not found
}

declare var System: any;
// 获取locale文件
function getTranslationsWithSystemJs(file: string) {
 let text = '';
 const fileRequest = new XMLHttpRequest();
 fileRequest.open('GET', file, false);
 fileRequest.onerror = function (err) {
  console.log(err);
 };
 fileRequest.onreadystatechange = function () {
  if (fileRequest.readyState === 4) {
   if (fileRequest.status === 200 || fileRequest.status === 0) {
    text = fileRequest.responseText;
   }
  }
 };
 fileRequest.send();
 const observable = Observable.of(text);
 const prom = observable.toPromise();
 return prom;
}

main.ts文件修改为

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
import { getTranslationProviders } from './app/i18n-providers';

if (environment.production) {
 enableProdMode();
}

getTranslationProviders().then(providers => {
 const options = { providers };
 platformBrowserDynamic().bootstrapModule(AppModule, options)
  .catch(err => console.log(err));
});

别忘了将locale目录添加到.angular-cli.json里,来单独打包。

这样我们对静态文案的翻译工作基本已经完成了,但是有些动态文案如ts文件里的文案或者第三方框架属性该如何翻译呢?下面会介绍针对 ts 文件和 NG-ZORRO 框架实现动态文案翻译的方案。